A resistor and a capacitor are connected in series across an ideal battery having a constant voltage across its terminals. Long after contact is made with the battery (a) the voltage across the capacitor is A) equal to the battery's terminal voltage. B) less than the battery's terminal voltage, but greater than zero. C) zero. (b) the voltage across the resistor is A) equal to the battery's terminal voltage. B) less than the battery's terminal voltage, but greater than zero. C) zero.

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Miss Kitty

Physics

24 December, 19:18

A resistor and a capacitor are connected in series across an ideal battery having a constant voltage across its terminals. Long after contact is made with the battery (a) the voltage across the capacitor is A) equal to the battery's terminal voltage. B) less than the battery's terminal voltage, but greater than zero. C) zero. (b) the voltage across the resistor is A) equal to the battery's terminal voltage. B) less than the battery's terminal voltage, but greater than zero. C) zero.

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Salvador Hoffman · Answer 1

A) equal to the battery's terminal voltage.

Explanation:

When the capacitor is fully charged after long hours of charging, its potential becomes equal to the emf of the battery and its polarity is opposite to that of battery. Hence net emf becomes equal. The capacitor itself becomes a battery which is connected in the circuit with opposite polarity. This results in the net emf and current becoming zero. There is no charging current when the capacitor is fully charged.